Sewing-machine shears



Feb. 28, 1939. D O H AN, 2,149,239

SEWING-MACHINE SHEARS Filed Oct. 14, 1937 Inven Lor', DRAYTON CocfiRAN,

mez 7/ @d AU orney.

Patented Feb. 28, 1939 UNITED STATES PATENT OFFICE SEWING-MACHINE snmmsApplication October 14, 1937, Serial No. 168,990

1 Claim.

In the expeditious sewing of goods in quantity production one piececlosely follows another in the sewing machine so that the seam runsfrom. one piece to the next and connects them in order to obviate thenecessity of picking up free ends of the needle and shuttle threads witheach piece to be sewed. The pieces are subsequently cut apart. In thestitching of bindings to the edges of fabrics, and particularly in thestitching of binding tape to the edges of rugs and carpets it isnecessary to cut across the binding and free each rug as the stitchingis completed, remove it and return the traveling table from the rear ofthe sewing machine to the front of the sewing machine to receive thenext rug. The severing has to be made by shears located in line withedge and binding after they have been sewed together and on the oppositeside of the machine from where the operator is seated.

The object of this invention is to provide a shears that is suitablylocated for severing the tape close to the ends of the rug seam andprovided with means for its operation in convenient location for theoperator of the sewing machine.

In the accompanying sheet of drawings which forms a part of thisdescription,

Figure 1 is a top view of a sewing machine and associated shears whichembodies this invention.

Fig. 2 is a front elevation of the same with the shears closed.

Fig. 3 is a vertical section through the supporting table of the sewingmachine showing the shears in elevation and open.

The invention is shown in connection with a sewing machine such as isset forth in United States Patent No. 1,975,728, dated October 2, 1934,for a Sewing machine for attaching a binding tape to the cut edge of arug or carpet, to which reference is made for details not shown herein.The sewing machine has the usual overhanging bracket arm l0, needle II,and bed plate l2, setting on a table I3. At the side of the machine is atraveling table H which can he slid from a position in front of thesewing machine to a position at the rear of the machine, and has a widthof about thirty inches and a length of about twelve feet convenient forthe support of a rolled-up rug or carpet. A roll of tape to be stitchedto the edge of the rug is carried by de- 50 pending bars IS. The rugmoves with the traveling table as the edge passes through the sewingmachine.

Shears mounted in line with the stitched edge consist of afixed blade l6parallel with the bed plate and a movable blade I l carried by a leverl8 fulcrumed on a pivot I9 of a frame 20. In order that cutting edge ofthe fixed blade may be 5 low enough for the work to readily pass overit, the frame projects into a mortice in the sewingmachine table. Theblades are of sufficient length to sever the tape in one stroke. Thelever is operated by an eccentric or cam 2| on a shaft 10 22 whichconnects with an actuating handle 23 on the opposite side of the sewingmachine from the shears in convenient location for operation by theoperator of the machine. The eccentric opcrates with progressivelyincreasing mechanical l5 advantage as the blades close on the work, and,when the severing is being effected near the tips of the shear blades,the eccentric is brought to its uppermost point with maximum mechanicaladvantage. A spring 24 opens the shears.

The rug rolled up is placed upon the traveling table, partially unrolledand the edge with the tape leading underneath are fed through the sewingmachine, the table traveling with the rug as the sewing proceeds. Whenthe end of the rug seam has reached the shears and a few stitches havebeen taken in the tape by itself, the sewing machine is stopped and thetape is severed close to the end of the rug seam thereby freeing the rugwhich is then removed and. the travelin table is run back to the frontof the sewing machine and the next rug is placed thereon, the edgeentered in the machine and its stitching is commenced. When the forwardend of the stitched edge reaches the shears there is a short length oftape projecting which is sheared off and discarded.

I claim:

The combination with a sewing machine having an overhanging bracket armadapted for sewing a binding tape to the edge of a fabric, of shearscomprising a fixed blade mounted in line with the tape and fabric and acooperating pivoted movable blade, a lever for carrying the movableblade, a cam for operating the lever with pro- 45 gressively increasingmechanical advantage as the blades are closed on the work, a shaftextending to the front of the machine and carrying the cam, and anactuating handle mounted on the shaft on the opposite side of themachine from the shears.

DRAYTON OOCHRAN.

